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A Harvard School of Public Health study found that older people with high levels of omega-3 fatty acids in their blood lived about 2.2 years longer than people without the high levels of omega-3s. They also had 35% percent lower rates of heart disease.

“Our findings support the importance of adequate blood omega-3 levels for cardiovascular health,” says lead researcher Dariush Mozaffarian, associate professor in the Department of Epidemiology at Harvard.

Which types of seafood are the best for you? Experts say to focus on the types that are rich in protein and heart-healthy fatty acids, such as salmon, tuna, mackerel and trout.